<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>div与span</title>
</head>
<body>
    
<!-- div 独占一行 盒子 -->
<div> 111111111</div>

<div>22222222222222</div>

<div>3333333333</div>

<div>444444444444</div>

<div>5555555555555</div>

<!-- span  单独修饰 -->

<h3>aaaaaaaaaa<span style="color: gray; size: 10px;">ssssss</span></h3>

</body>
</html>